Class: TouchBarPopover 
Create a popover in the touch bar for native macOS applications
Process: Main
This class is not exported from the 'electron' module. It is only available as a return value of other methods in the Electron API.
new TouchBarPopover(options) 
- optionsObject- labelstring (optional) - Popover button text.
- iconNativeImage (optional) - Popover button icon.
- itemsTouchBar - Items to display in the popover.
- showCloseButtonboolean (optional) -- trueto display a close button on the left of the popover,- falseto not show it. Default is- true.
 
Instance Properties 
The following properties are available on instances of TouchBarPopover:
touchBarPopover.label 
A string representing the popover's current button text. Changing this value immediately updates the popover in the touch bar.
touchBarPopover.icon 
A NativeImage representing the popover's current button icon. Changing this value immediately updates the popover in the touch bar.